Adjustment of filling tension in fluid jet loom and apparatus thereof

ABSTRACT

Filling yarn tension adjusting apparatus for use in a fluid jet loom including a suction jet established outside the selvage on one side of the fell of cloth to receive the tip of a projected filling yarn with substantially constant tension, the suction jet being movable along with a reed of the loom to permit beating without bending or varying the tension in the filling yarn. The sucking of the filling yarn with a substantially constant tension permits the use of a detector device for mechanically sensing the presence of the filling yarn and a control device for timing the cutting of the filling yarn. In one modification, the suction jet forms a guidance path for initially sucking the tip of the filling yarn and cooperates with a surrounding tension path at an annular opening to provide constant tension of the filling yarn.

United States Patent 11 1 Yano et al.

[111- 3,744,533 14 1 July 10,1973

[ ADJUSTMENT OF FILLING TENSION IN FLUID JET LOOM AND APPARATUS Teijin Limited, Kita-ku, Osaka, Japan Assignee:

Filed: Aug. 3, 1971 Appl. No.: 168,622

References Cited UNITED STATES PATENTS 3,124,167 3/1964 Te Strake 139/127 P 2,637,349 5/1953 Dunham 139/127 P 3,410,316 11/1968 Giuttari t 139/302 1,921,396 8/1933 Pool [39/127 P Primary Examiner-Henry S. .laudon Attorney-Sherman & Shalloway 5 7 1 ABSTRACT Filling yarn tension adjusting apparatus for use in a fluid jet loom including a suction jet established outside the selvage on one side of the fell of cloth to receive the tip of a projected filling yam with substantially constant tension, thevsuction jet being movable along with a reed of the loom to permit beating without bending or varying the tension in the filling yam. The sucking of the filling yarn with a substantially constant tension permits the use of a detector device for mechanically sensing the presence of the filling yarn and a control device for timing the cutting of the filling yarn. in one modification, the suction jet forms a guidance path for initially sucking the tip of the filling yarn and cooperates with a surrounding tension path at an annular opening to provide constant tension of the filling yarn.

8 Claims, 15 Drawing Figures PATENTEDJUL 1 0 1m SHEET 2 UF- 6 u la: H

\K MIL mm 9 NB 5 PATENHZLJUL 1 0 I975 SHEET 3 OF 6 I PAIENIEDJUL 1mm SHEET u [If 6 ADJUSTMENT OF FILLING TENSION IN FLUID JET LOOM AND APPARATUS THEREOF The present invention relates to adjustment of inserted filling yarn tension, the detection of filling yarn in the warp shed and the treatment of the tip of the fill ing yarn projecting from the selvage in a fluid jet loom. Conventional apparatus of this type has produced inconsistent quality across the width of the fabric where picking is conducted by a fluid jet and followed by beating-up.

First when the filling yarn is shot into the shed by a fluid jet, the speed of the jet usually decreases considerably because of air resistance or its own diffusion from the picking jet nozzle to the selvage on the opposite side. The filling yarn carried by this fluid jet also changes its speed. That is, yarn tension near the picking jet nozzle is high, but it gradually decreases.

Secondly the tip of the inserted filling yarn on the opposite side is not gripped and, since it is free it consequently buckles by itself immediately after jet suspension to become nonrectilinear.

Third the portion of the filling yarn on the side of the picking jet nozzle is tensioned with the advance of the reed and the difference on the opposite side is enlarged. If beating-up is continued in such a way, a difference in fabric quality occurs between the picking jet nozzle side and the opposite side.'ln the present invention, with strengthening of decreasing yarn tension in mind, another fluid jet discharging device is disposed outside the selvage on the opposite side the device being synchronized with the reed. The fluid jet is divided into a picking jet which causes the filling yarnto fly into the shed and a suction jet which sucks the tip of the flown filling yarn to impart tension to it.

In the present invention, the above-described picking jet and suction jet cooperate such that the picking jet decreases the yarn tension at the tip of the advancing filling yarn, and the tip is arrested by the suction jet device arranged outside the selvage on the opposite side such that tension is applied to the filling yarn in addition. The addition of tension is, however, well known in the art and the present invention is characterized by the suction jet being synchronous with the reed. The detection of the filling yarn has become possible by the application of the suction jet. ln general, in a fluid jet loom, it was difficult to detect the picking, that is, the

presence of the filling yarn in the shed, by contact with a wire-like filling feeler with the filling yarn on the suction jet side. This is because tension at the tip of the filling yarn is unstable and its position is unstable as well,; and, thus, despite the presence of the filling yarn, the filling yarn may not come in contact with the filling feeler which is disposed in a given place. To check the presence of the filling yarn electrically, positive and negative electrodes were disposed on the suction jet side to detect the filling yarn when the filling yarn feeler. Since at the conclusion of beating up, the tip of the filling yarn is under tension and arranged in place with the suction jet, it is possible to control easily the time when the filling yarn is cut off with a cutter, say an electric heater cutter through the control of positioning the tip of the filling yarn.

in a fluid jet loom, as the speed of the fluid decreases during its flying, the tip of the filling yarn tobe picked, that at first runs at a given speed, decreases considerably its speed when it reaches the selvage on the suction jet side. Further as the tip of the filling yarn is not gripped at all and it is in the free state, the filling yarn buckles by itself and the loosening is accelerated. In addition, as the portion on the picking jet side is being higher tensioned with the forwarding of the reed, the state of the filling yarn in the shed at the start of beating up is such that tension near the picking nozzle is high, but near the selvage on the opposite side it is low. If such beating-up is allowed, there occur differences in warp tension, warp density, luster, etc. between the picking jet side and the opposite side, and they constitute a serious quality defect in fabrics. For avoiding this effect, in the past the tip of the filling yarn jumping outside the side opposite to the picking nozzle has been sucked by a suction jet. The suction device, which has been disposed in the stationary state, could not eliminate the above-described defect however.

First in picking, the filling yarn flies near the front of the dents in substantially the largest shed. Hence the suction jet should be disposed on the flying line and outside the oscillating reed so that the filling yarn does not come into contact with the reed.

Thus the filling yarn, the tip of which is sucked with the above-described suction jet, is rubbed and twisted by the edge on the suction jet side of the advancing reed for beating-up and carried up to the fell of cloth. During this twisting, it is subjected to considerable tension variations and is squeezed, deformed, and damaged by the edge of the reed.

Second, generally the reed is much longer than the width of fabric and the suction jet positioned outside the reed is considerably apart from the selvage on the suction jet side. The amount of the filling yarn (later cut off) projecting outside the selvage on the suction jet side becomes great and it would cause much loss in the filling yarn.

The present invention eliminates the abovedescribed defects. As described above, a suction nozzle has hitherto been secured in a stationary manner outside the reed. In contrast, a suction nozzle is not secured but slidable. That is, the suction nozzle is attached to part of the reed or a frame other than the reed so that it is slidable synchronously with the reed. In this case, the suction jet arrests the tip of the filling yarn, and sucks it to tension it. The suction jet moves together with the reed when the picked filling yarn is pushed toward the fell of cloth by the progress of the reed, and the locus of movement of the filling yarn under suction is stabilized. v

In the present invention, the following two essentials are required.

A. While the filling yarn is afloat in the shed after the conclusion of picking, the tip of the filling yarn is sucked by a fluid jet and the filling yarn is tensioned mainly by the suction force in its floating state in the shed.

B. By continuous suction, tension due to the suction is maintained, and the point of suction is adjusted such that no twisting causing substantially tension variations occurs to transfer the filling yarn to the fell of cloth on a given locus of movement of the filling yarn.

The primary object of the present invention is to maintain filling yarn tension uniformly, to transfer it to the fell of cloth on a given locus and thereby to obtain consistent fabric. In order that this object may be attained, the adaptability of a suction jet should be considered. It is desirable that the suction force be strong and constant and that the filling yarn be continuously sucked at a given point of a jet. In the present invention a suction nozzle has been improved and the tip of the filling yarn on the suction jet side can be held on a given locus of movement of the filling yarn under a given tension. With the use of this condition, the sensing of picking is conducted with a filling feeler and the timing for cutting the waste filling yarn is controlled.

The above-described improvements such as improvements in a suction nozzle, the sensing of picking and the treatment of waste yarn are all related to controlling filling yarn .by the tip of the filling yarn.

The present invention will be described with reference to the accompanying drawings.

FIGS. 1 to show one embodiment of the present invention. FIG. 1 is a perspective view. FIGS. 2 to 4 are side views showing the suction state of the filling yarn in succession. FIG. 5 is a vertical side section of a fluid jet.

FIGS. 6 to 7 show perspective views of other embodiments, respectively.

FIGS. 8 and 9 are vertical side sections of the improved suction jets of the present invention.

FIGS. 10 to show embodiments of treatment of waste filling yarn; FIG. 10 is a vertical side section; FIG. 11 shows a section along the line AA in FIG. 10; FIGS. 12 to 14 are modifications; FIG. 15 shows a circuit for picking.

In FIGS. 1 to 5, numeral 1 is warp yarn, numeral 2 is the fell of cloth, numeral 3 is a reed, numeral 4 is a reed frame, and numeral 5 is waste yarn. Numeral 6 is filling yarn and numeral 6' is the tip of the picked filling yarn. Numeral 7 is a conduit providing a passage a fluid jet and a fluid is connected with feed and exhaust means (not shown) and runs in the direction of anarrow. The conduit 7 is secured to the reed frame 4 by fitting means 8.

Further the conduit 7 is longitudinally notched at a portion on the fell of cloth side, forming a suction portion 9. At the suction portion 9, the fluid exhausted by an exhaust port 10 is exposed until it is received by an intake port 11 to make a suction jet 12.

The relationships between the suction jet l2 and the filling yarn 6 are described below.

The suction jet 12 viewed from the fell of cloth 2 moves together with the reed frame 4 while running in the direction of crossing the locus of movement of the filling yarn 6, that is, the flying line (In this case, they cross each other at right angles). As a result, immediately after picking, it is spaced considerably behind the filling yarn 6 as shown in FIG. 2. Thus the filling yarn 6 is afloat in the shed and the tip of the filling yarn 6 comes into contact with the suction jet 12 in the floating state and begins to be sucked as shown in FIG. 3. Afterwards it continues to be sucked during the advancing of the reed frame 4 as shown in FIG. 4 and is beaten up in this state.

Since the filling yarn 6 is given constant tension by the suction force of the suction jet 12 when the filling yarn 6 is afloat in the shed substantially immediately after the conclusion of picking (The shift from FIG. 2 to FIG. 3 is done in a very short time.) and under the condition where fine and uniform adjustment of tension is very easy along the length of yarn, it is given a desired constant tension instantly on the basis of the tension given the filling yarn during the flying or without any relation to such a tension. Then as the filling yarn 6 is beaten up while maintaining the tension, it is beaten up under a desired constant tension as long as there is no special obstacle such as irregular contact with warp yarn. Even with a special obstacle, the suction with the suction jet is elastic and an appropriate buffer action occurs to bring on the beating-up under almost constant tension.

Another embodiment of the present invention will be described with reference to FIGS. 6 to 7. In FIG. 6, for sucking the tip 16' of the filling yarn 16 immediately after picking, there is used a suction nozzle 19 exhausting a jet in substantially the same direction as the flying direction of the filling yarn.

The suction nozzle 19 is connected to a lever 18 movable in the directions of arrows a, b, via a path 17.

Hence right after picking, the suction portion 19 moves backward (direction of the arrow a), sucks the tip of the filling yarn 16', moves forward (direction of the arrow b) continuing the suction as the reed advances to finish picking under a desired constant tension. In this case, the suction portion 19 moves independently of the reed and it becomes possible to control freely the movement of tip 16 of the filling yarn toward the fell of cloth at the start of the suction and during the suction. For instance, as shown in the drawing, when the suction portion 19 is disposed outside the reed frame, the tip 16' of the filling yarn flying together with a picking jet can be directly accepted into the nozzle of the suction portion 19 to begin the suction at once. As a result the suction portion 19 can not only control filling yarn tension after picking in such a way as not to let the filling yarn relax during and after picking'but help picking at the end of flying of the filling yarn.

Further it becomes POSSlbICflO advance the suction portion 19 toward the fell of cloth at timing or speeds faster than the advance of the reed, allow the whole filling yarn 16 or a portion on the suction side to move in the direction of the fell of cloth earlier than the reed and provide tension control suitable for properties of the filling yarn. FIG. 7 shows a suction portion 29 similar to suction nozzle 19 of FIG. 6 secured to the reed frame to have the same movement as the reed. The function resembles that of the one as shown in FIGS. 1 to 5.

The present invention features a movable or slidable suction nozzle whereas when positioning of a suction jet is fixed, the tip of the filling yarn on the suction jet side is bent and twisted by the running reed and carried to the fell of cloth such that the filling yarn is subjected to tension variations or squeezed at the tip, deformed and damaged. In order that this drawback may be eliminated, the suction jet is arranged to be synchronous with the reed in the present invention.

tion nozzle is not limited to the reed. As shown inFIG.

6, it may be attached to a frame other than the reed frame. The slidability need not be synchronous with the movement of the reed. In short, the amount of movement and speed of the suction nozzle are controlled such that the tip of the filling yarn is not twisted and does not cause tension variations at the time of beating up. In other words, it is essential to adjust the position of the point of suction and to thereby continue the suction under the conditions where tension variations do not occur on the filling yarn between the neighborhood of selvage on the picking nozzle side to the suction jet.

As one of the gists of the present invention, a path of fluid jet is formed on the reed frame and outside the selvage on the side opposite the picking nozzle such that the path crosses vertically the flying line of the filling yarn. Furthermore, in accordance with the present invention a suction nozzle is mounted on the reed frame slidably with the reed and the tip of the filling yarn is brought into contact with the exposed suction jet to be sucked by the jet.

The position of the filling yarn when the tip of the filling yarn is sucked by the suction jet is the lowest port 11 of the suction jet and it is desirable that the position agree with the bisector of an angle made by two raised and lowered warp yarns. The suction force of the suction jet of the present invention is controllable bywater pressure, jet apparatus, etc. When a high suction force is needed, higher water pressure will suffice.

In FIG. 5, the cross sectional area of the intake port 11 is caused to be greater than that of the exhaust port such that despite some diffusion due to'the exposure of the suction jet 12, almost all the amount of jet is received by the intake port 11. In addition, a throttled portion 13 is provided on the jet path below the intake port 11. The function of this throttled portion 13 will be described below. When the receipt by the inlet 11 of all the amount of the suction jet is wanted, the cross sectional area of the intake port 11 tends to be too great and a gap easily occurs between the inner wall surface of the path following the inlet and the outer surface of the jet. If the tip 6' of the filling yarn enters this gap, the filling yarn is not encircled by the jet thereby undergoing no suction action or'too low or unstable suction action. Accordingly the throttled portion 13 having a small. cross sectional area is so arranged as to positively eliminate the gap to cause the filling yarn to be encircled in the jet. However, if the throttled portion 13 is too small in its cross sectional area, the jet will run backward from here, and the degree of throttling should experimentally and carefully be determined.

The suction jet device in FIG. 5 has been found insufficient sometimes during its operation and has been improved as shown in FIGS. 8 and 9. In comparison of FIG. 5 with FIG. 8, the improvement of thelatter'is the modification of the passage 7 at the upstream portion.

That is, an inner path- 15 rectilinearly communicates with the passage 7 and an: outside annular path 16 encircles the whole inner path 15 and communicates with a supply path 14 and the inner path 15. These double paths are so arranged as to correct the disorder of the jet.

The supply path. 14 runs up from below with respect to the reed 3 as shown in FIG. 5 for the following reason. The source of water supply is fixed but the reed oscillates back and forth. In supplying water to the filling yarn control device attached to thereed, the supply path 14 is required to be slidable according to the movement of the reed. In this case, the oscillation of the supply path 14 has a problem in its durability, etc. of pipe material and to lessen the oscillation to a minimum, it is best to supply water at the oscillation lever shaft of a reed cap. Thus a water supply pipe is arranged from below.

The fluid carried through the supply path 14 has to change its, direction through to to be jetted from the exhaust port of the suction jet. The fluid sent from the supply path 14 by the change in direction of the fluid produces turbulent flow by the time it reaches the exhaust port of the suction jet. Thus the leading of the tip 6' of the filling yarn to the intake port is not completely conducted and there is a drawback that unevenness of the filling yarn increases.

In contrast, in the present invention, the water of the supply path 14 is led into the annular path 16 and returned cyclonically. Then it is put into the inner path 15 under pressure and moved rectilinearly.

The water in the rectilinear path 7 is, therefore, laminar and controlled such that its focusing power becomes great, and the suction of the tip of the filling yarn is intensified.

Now FIGS. 5 and 10 are compared. In FIG. 5, the cross sectional area of the intake port 11 is made greater than that of the exhaust port 10 such that even with some diffusion due to the exposure of the suction jet 12, almost all the jet is received in the intake port ll.'Besides the choke 13 is mounted on the path following the jet running direction from the intake port 11. When the receipt of all the suction jet 12 at the intake port is desired, the cross sectional area of the intake port 1 1 tends to be too great, and as a result a gap tends to occur between the inner wall surface of path following the intake port 11 and the outerface of the jet. If the tip 6 of the filling yarn enters this gap, the filling yarn will not be contained in the jet, and it will not undergo suction action or will be subjected to only a suction action too small or unstable. Accordingly the choke 13 having a small cross sectional area of opening is provided to positively eliminate the gap and cause the filling yarn to be contained in the jet.

However if the cross sectional area of the opening at the choke 13 is too small, the jet will run backward.

Thus the degree of choking should be determined ex perimentally and carefully. 1

his not easy to determine accurately the dimension of the choke 13 such that the function is maintained correctly. Speaking practically, it is necessary to make the cross sectional area of the choke greater than that of the exhaust port 10. How much larger it is should be experimentally determined. The increase of cross sectional area of the choke 13 causes a decrease in jet pressure and a decrease in filling yarn' tension to that extent.

Especially when pressure at the exhaust port 10 varies periodically or irregularly, a problem arises as to at what point of the varying pressure is made the standard of dimension of the choke l3'. Even if the point is determined, there is a tendency for a gap to occur as pressure decreases.

Such a problem is caused by the use of a single jet to provide the two functions of suction of the filling yarn to provide, the guidance and tension production. As described above, in the present invention, the paths for guidance and tension production are separately provided.

In FIG. 9, numeral 21 is a bypass passage for yarn tension production, numeral 22 is a path for yarn guidance and they are supplied with fluid through a common supply path 23. These three paths are all attached to the reed. The guidance path 22 is partly notched and forms a suction jet 24, an exhaust port 24 and an intake port 24" as in FIGS. 1 to 5. The passage 21 for tension production communicates with a liquid chamber' 25 and a doughnut-shaped exhaust port 27 encircles the exhaust port 26 of the guidance path 22 to discharge a jet in substantially the same direction as the jet running direction from the exhaust port 26.

Hence the guidance path 22 and the suction jet 24 have only to suck the tip of the filling yarn into the jet and lead it to the exhaust port 27, and a weak jet will suffice. Consequently there is no need to consider strictly the percentage of each cross sectional area of an exhaust port 24, an intake port 24" and the following path (that is, the presence of a choke) because of the weak jet. That is, even if a gap occurs between the jet and the fluid inner wall, the simple guidance action is sufficiently performed.

In contrast, as a strong jet from the path for tension encircles the tip of the filling yarn exiting the exhaust port 26 and acts on it, a strong, constant tension is given to the filling yarn. That is, the jet encircles the filling yarn; thus there is no problem of a gap as in the embodiment shown in FIGS. 1 to 5. Further the jet can easily be strengthened.

In the present invention there is no need to mount the guidance path and the tension path on the reed in parallel and they may be mounted on any part such that they are synchronous with the reed. Furthermore both paths may be separately provided in any shape and state and supplied with fluid from separate supply sources provided that the guidance ,path runs in the direction in which the suction jet crosses the filling yarn flying direction; and the exhaust port of the tension path encircles the outlet of the guidance path and can discharge a jet in substantially the same direction as a jet from the outlet.

The exhaust port, as shown in the drawing, preferably encircles the whole periphery of the outlet and has a doughnut-shaped opening, but the doughnut shape may be such that more than half the periphery of the picking jet nozzle side of the outlet may be encircled, less than half the periphery is notched. The reason why the exhaust port has its opening on the picking nozzle side is that the filling yarn bent at the intake port 24" is led along the inner wall of nozzle side of the guidance path and should positively be separated from the inner wall by the jet discharged through the doughnut shaped exhaust port. The present invention is as described above and can sufficiently attain the desired object.

In the present invention, tension is applied to the tip of the filling yarn on the suction jet side to eliminate the sagging. With the use of this tensioning the tip of the filling yarn, an electrical detector of picking and the cutting of yarn end can be provided. An embodiment ofsuch a detector will be described referring to FIGS. to 15. FIG. 10 is a side view showing the selvage on the suction. jet side, a reed and a suction jet device. A stopper 30 is disposed at a distance of about 1 mm backward from the fell of cloth with the other end screwed to an arm 31. The arm 31 is secured to a temple bar 32. The stopper 30 is held in a given position, but a gap of about 1 mm between dents 3 and the stopper 30 is arranged so that when the dents 3 approach the fell of cloth, the dents 3 do not hit the stopper 30. A detector needle 33 dangles outside of the stopper 30 on the selvage. The detector needle 33 is rotatably supported about a fulcrum 34 and on end 35 of the detector needle 33 is urged against a contact plate 36 by gravity or with a spring. In FIG. 15, a fly wheel 43 mounted on the loom frame 42 rotates synchronously with beating-up. A permanent magnet 44 is attached to the fly wheel 43 and in the opposite position a generating coil L is disposed. When the detector needle dangles, the contact plate 36 is off. When it is pushed by the filling yarn, the contact plate turns on. Under this condition, the permanent magnet 44 and the generating coil L operate to constitute a trigger signal generator, and at the same time the trigger signal is adapted to be amplified with an amplifier consisting of a transistor TR and protective resistance R to be actuated under electric source [5,. A variable resistance VR is connected to the collector of transistor TR, and its movable terminal is connected to the gate of a control circuit including an excitation coil for an automatic stop indicating relay S connected in series with a siliconcontrolled rectifier SCR, a reset switch S and the electric source E In such way, when the variable resistance VR is started in the appropriately set state, triggersignal voltage for a comparatively short time is impressed in thetransistor T at the same ,cycle as beating cycle, and consequently it is amplified and allows the trigger signal to be imparted to the'gate of the silicon controlled rectifier SCR under the deviation action of resistance R Thus the silicon control rectifier SCR is instantly triggered to energize relay S, and automatically stops the loom. When the filling yarn is present, the loom will not stop since the trigger signal is disconnected by the contact plate 36. In such a way picking is completely checked.

A cutter 40 is provided between the selvage and the stopper 30. With reference to FIGS. 1 to 4, which show cross sections along line AA of FIG. 10, operations in each element will be described. In FIG. 1, the filling yarn 6 is picked and its tip is about to be sucked with the suction jet 9. When the tip of the filling yarn is arrested by the suction jet 9, the tip moves together with the jet fluid and is subjected to suction force. The tip of the filling yarn is tensioned by the suction force. In FIG. 12, the reed and the suction nozzle further advance and first the tip of the filling yarn comes into contact with the stopper 30. The suction jet 9 is positioned in front of the dents, and the tension of tip of the filling yarn in the neighborhood of the stopper 30 is intensified all the more. The dents advance .under such conditions and are positioned as shown in FIG. 13. At this time the filling yarn hits the detector needle 33 to check the presence of the picked filling yarn. When no picking occurs, the loom is stopped.

The filling yarn cutter 40 is arranged between the selvage and the stopper 30, and one or two thread guides 41 are attached to the reed opposing the cutter. In FIG. 13, the thread guide 41 presses the filling yarn 6 to the yarn cutter 40 to facilitate the cutting of the filling yarn. The cut yarn is conveyed out by the jet. FIG. 4

shows that the operation is finished, the reed 3 is about to leave the fell of cloth.

The operations of checking picking and cutting the filling yarn at selvage have, in the prior art, been very unreliable in that the tension of the tip of the filling yarn on the suction jet side is low and tension variations are great.

The yarn tension adjusting methods and apparatus of the present invention can produce and maintain a constant tension at the tip of the filling yarn to render the above-described operations successful.

We claim:

1. Filling yarn tension adjusting apparatus for use in a fluid jet loom of the type projecting a filling yarn in a flying line through a shed from a first side of the fell of cloth to a second side of the fell of cloth at which a selvage is formedand including a reed movable for beating the cloth, said apparatus comprising suction means carried by the reed outside the selvage on the second side of the fell of cloth, said suction means including an exhaust port and an intake port establishing a fluid jet stream movable with the reed in a path transversely crossing the flying line of the filling yarn, said fluid jet stream being exposed between said exhaust and intake ports to form a suction jet sucking in the tip of the filling yarn such that the filling yarn is afloat and sectional area'of said intake portion whereby said suction jet is substantially entirelyreceived in'said'intake port and said jet is continuous in the same direction to encircle the tip of the sucked filling yarn.

2. The apparatus as recited in claim -1 wherein said suction means includes supply means supplying fluid in a first'path to said exhaust port and in a second path, and said means forming a path downstream of said intake port includes first means receiving said fluid from said first path and second means defining an annular opening around said first means receiving fluid from said second path; v r v 3. The apparatus as recited in claim 1 wherein said suction means includes first means forming a guidance path for the filling yarn and second means forming a tension path for the filling yarn, said first means including said suction jet formed by said exhaust and intake ports and said path forming means downstream of said port having an opening disposed more than halfway around said path forming means to issue fluid in said tension path in substantially the same direction as said fluid in said guidance path.

4. The apparatus as recited in claim 1 and further comprising detector means disposed between the selvage on the second side of the fell of cloth and said suction means, said detector means including a member for contacting the filling yarn during beating, said detector means providing a signal for stopping the loom when the member fails to contact a filling yarn during beating.

5. The apparatus as recited in claim 1 and further comprising cutting means and stopper means disposed between the selvage on the second side of the fell of cloth and said suction means opposite the reed, said cutting means being disposed closer to the selvage and said stopper means and said cutting means being relatively adjustable to adjust cutting of the filling yarn with respect to beating.

6. Filling yarn tension adjusting apparatus for use in a fluid jet loom of the type projecting a filling yarn in a flying line through a shed from a first side of the fell of cloth to a second side of the fell of cloth at which a selvage is formed, said apparatus comprising suction means movably disposed on the second side of the fell of cloth outside the selvage, said suction means including water supply means, an exhaust port communicating with said water supply means to provide an exposed and: means movably mounting said suction means to intake port and said second means including an outlet I move said water suction jet in a path transversely crossing the flying line of the filling yarn whereby the filling yarn is sucked into said water suction jet with substantially constant tension.

7. The apparatus as recited in claim 6 wherein the fluid jet loom includes a reed, said support means mounts said suction means on the reed for movement therewith to permit beating without bending the filling yarn, and said suction means includes a conduit having a notch formed therein to define said exhaust port and said intake port.

8. The apparatus as recited in claim 7 wherein said water supply means includes a first path supplying water to said exhaust port and a second path and'means downstream of said intake port defining an inner outlet receiving said water suction jet from said first path and an outer outlet surrounding said inner outlet to form an .annular opening receiving water from said second path. 

1. Filling yarn tension adjusting apparatus for use in a fluid jet loom of the type projecting a filling yarn in a flying line through a shed from a first side of the fell of cloth to a second side of the fell of cloth at which a selvage is formed and including a reed movable for beating the cloth, said apparatus comprising suction means carried by the reed outside the selvage on the second side of the fell of cloth, said suction means including an exhaust port and an intake port establishing a fluid jet stream movable with the reed in a path transversely crossing the flying line of the filling yarn, said fluid jet stream being exposed between said exhaust and intake ports to form a suction jet sucking in the tip of the filling yarn such that the filling yarn is afloat and extended along the flying line and is moved for beating without bending under substantially constant tension, said intake port having a cross-sectional area greater than the cross-sectional area of said exhaust port, and said suction means including means forming a path downstream of said intake port having a cross-sectional area of at least a portion thereof less than the cross-sectional area of said intake portion whereby said suction jet is substantially entirely received in said intake port and said jet is continuous in the same direction to encircle the tip of the sucked filling yarn.
 2. The apparatus as recited in claim 1 wherein said suction means includes supply meanS supplying fluid in a first path to said exhaust port and in a second path, and said means forming a path downstream of said intake port includes first means receiving said fluid from said first path and second means defining an annular opening around said first means receiving fluid from said second path.
 3. The apparatus as recited in claim 1 wherein said suction means includes first means forming a guidance path for the filling yarn and second means forming a tension path for the filling yarn, said first means including said suction jet formed by said exhaust and intake ports and said path forming means downstream of said intake port and said second means including an outlet port having an opening disposed more than halfway around said path forming means to issue fluid in said tension path in substantially the same direction as said fluid in said guidance path.
 4. The apparatus as recited in claim 1 and further comprising detector means disposed between the selvage on the second side of the fell of cloth and said suction means, said detector means including a member for contacting the filling yarn during beating, said detector means providing a signal for stopping the loom when the member fails to contact a filling yarn during beating.
 5. The apparatus as recited in claim 1 and further comprising cutting means and stopper means disposed between the selvage on the second side of the fell of cloth and said suction means opposite the reed, said cutting means being disposed closer to the selvage and said stopper means and said cutting means being relatively adjustable to adjust cutting of the filling yarn with respect to beating.
 6. Filling yarn tension adjusting apparatus for use in a fluid jet loom of the type projecting a filling yarn in a flying line through a shed from a first side of the fell of cloth to a second side of the fell of cloth at which a selvage is formed, said apparatus comprising suction means movably disposed on the second side of the fell of cloth outside the selvage, said suction means including water supply means, an exhaust port communicating with said water supply means to provide an exposed water suction jet, an intake port having a cross-sectional area greater than the cross-sectional area of said exhaust port for receiving said water suction jet, and means movably mounting said suction means to move said water suction jet in a path transversely crossing the flying line of the filling yarn whereby the filling yarn is sucked into said water suction jet with substantially constant tension.
 7. The apparatus as recited in claim 6 wherein the fluid jet loom includes a reed, said support means mounts said suction means on the reed for movement therewith to permit beating without bending the filling yarn, and said suction means includes a conduit having a notch formed therein to define said exhaust port and said intake port.
 8. The apparatus as recited in claim 7 wherein said water supply means includes a first path supplying water to said exhaust port and a second path and means downstream of said intake port defining an inner outlet receiving said water suction jet from said first path and an outer outlet surrounding said inner outlet to form an annular opening receiving water from said second path. 